Backstopping
支援（backstop的现在分词）
🗣️ 情景例句
I suggest you give her a call straight away.
我建议你立即打个电话给她。
Delays are dangerous.
坐失良机必有忧患。
Dan wondered why he was wanted by the police, but he went to the station yesterday and now he is not worried anymore.
丹奇怪警察为什么找他，但昨天还是去了，结果他一再担心了。